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      </a></span></div></div> <div data-v-5bb33761><div data-v-5bb33761><main class="page" style="padding-right:0;"><section style="display:;"><div class="page-title"><h1 class="title">元编程(犀牛书)</h1> <div data-v-8a445198><i class="iconfont reco-account" data-v-8a445198><span data-v-8a445198>jiaojiao</span></i> <i class="iconfont reco-date" data-v-8a445198><span data-v-8a445198>7/23/2022</span></i> <i class="iconfont reco-eye" data-v-8a445198><span id="/jiaojiao-blog/docs/%E8%AF%BB%E4%B9%A6%E7%AC%94%E8%AE%B0/%E5%85%83%E7%BC%96%E7%A8%8B.html" data-flag-title="Your Article Title" class="leancloud-visitors" data-v-8a445198><a class="leancloud-visitors-count" style="font-size:.9rem;font-weight:normal;color:#999;"></a></span></i> <i class="tags iconfont reco-tag" data-v-8a445198><span class="tag-item" data-v-8a445198>js</span></i></div></div> <div class="theme-reco-content content__default"><h3 id="第十四章-元编程"><a href="#第十四章-元编程" class="header-anchor">#</a> 第十四章：元编程</h3> <blockquote><p>元编程的概念</p> <p>如果说常规编程是写代码去操作数据，那么元编程就是写代码去操作其他代码</p></blockquote> <h4 id="javascript的属性"><a href="#javascript的属性" class="header-anchor">#</a> JavaScript的属性</h4> <p>可分为两者</p> <ol><li><h5 id="数据属性"><a href="#数据属性" class="header-anchor">#</a> 数据属性</h5> <blockquote><p>即有一个名字和一个值(value)</p></blockquote> <p>数据属性有四个特性</p> <ul><li>value，代表这个属性在栈中存储的值</li> <li>writable，指定value是否可以被修改</li> <li>enumerable(可枚举)，指定是否可以通过for/in循环或Object.keys()方法枚举属性</li> <li>configurable(可配置)，指定是否可以修改属性，以及是否可以修改属性的特性</li></ul> <p>对象字面量中定义的属性，或者通过常规赋值方式给对象定义的属性都可写，可枚举和可配置。</p></li> <li><h5 id="访问器属性"><a href="#访问器属性" class="header-anchor">#</a> 访问器属性</h5> <blockquote><p>即没有value，访问该属性的返回值有访问器函数决定</p></blockquote> <p>访问器函数有四个特性</p> <ul><li>get，为函数，函数的返回值为访问对象该属性时所返回的值</li> <li>set，为函数，函数接收属性的新值为参数，又set函数决定是否修改旧值为新值</li> <li>enumerable(可枚举)，指定是否可以通过for/in循环或Object.keys()方法枚举属性</li> <li>configurable(可配置)，指定是否可以修改属性，以及是否可以修改属性的特性</li></ul> <blockquote><p><strong>要获得特定对象某个属性的属性描述符即特性，可以调用Object.getOwnPropertyDescriptor()</strong></p> <p>该方法只对自有属性有效。要查询继承属性的特性，必须自己沿原型链上溯</p></blockquote> <blockquote><p>要设置属性的特性或者要创建一个具有指定特性的属性，可以调用</p> <p>Object.defineProperty()</p> <p>传入要修改的对象、要创建的属性的名字，以及属性描述符对象</p> <p>Object.defineProperties()(一次性创建或修改多个属性)</p> <p>第一个参数是要创建或修改属性的对象，第二个参数也是一个对象，该键都为要创建或修改的属性名，值都为属性描述符对象</p></blockquote> <p>如果是创建新属性，那么省略的特性会取得false或undefined。如果是修改已有属性，那么省略的特性不会改变。</p> <p><strong>继承的属性不会被修改！！！！！</strong></p> <blockquote><p>Object.create()</p> <p>给方法用于创建新对象，第一个参数用于指定 新创建的对象的原型对象。</p> <p>第二个参数为可选参数，该参数与Object.defineProperties()的第二个参数相同。用于给创建的新对象添加并设定属性特性</p></blockquote></li></ol> <h4 id="object-defineproperty注意事项"><a href="#object-defineproperty注意事项" class="header-anchor">#</a> Object.defineProperty注意事项！！！</h4> <ul><li>如果对象不可扩展，<strong>可以</strong>修改其已有属性，但不能给它添加新属性。</li> <li>如果属性不可配置，不能修改其configurable或enumerable特性</li> <li>如果访问器属性不可配置，不能修改其获取方法和设置方法，也不能把它修改为数据属性</li> <li>如果数据属性不可配置，不能把它修改为访问器属性</li> <li>如果数据属性不可配置，不能把它的writable特性由false改为true，==<strong>反之可以</strong>==！</li> <li>如果数据属性不可配置且不可写，则不能修改其value，如果可配置不可写，则可以修改其vlaue</li></ul> <blockquote><p>Object.assign()</p> <p>用于把一个或多个源对象的属性值复制到目标对象。</p> <p>该方法只赋值可枚举属性和属性值，不复制属性的特性。</p> <p><strong>并且如果复制的属性有访问器属性，则复制到目标对象的是获取函数的返回值</strong></p></blockquote> <p>==p344   从一个对象向另一个对象赋值属性及它们的特性==</p> <h4 id="对象的可扩展"><a href="#对象的可扩展" class="header-anchor">#</a> 对象的可扩展</h4> <p>对象的可扩展特性控制着是否可以给对象添加新属性，即是否可扩展。</p> <blockquote><p>Object.isExtensible()</p> <p>用于确定一个对象是否可扩展</p> <p>Object.preventExtensions()</p> <p>使一个对象不可扩展（不可扩展的对象不可添加新属性且不能被修改原型）</p> <p>把对象修改为不可扩展是不可逆的。并且只会影响对象本身的可扩展能力。</p> <p>如果给一个不可扩展的对象的原型添加新的属性，该不可扩展对象依然会继承这些属性</p></blockquote> <p>extensible(可扩展)特性的作用是把对象'锁定'在已知状态，阻止外部篡改。</p> <p>由于extensible特性经常与属性的configurable及writable特性协同发挥作用</p> <p>所有JavaScript为此还定义的以下用于一起设置这些特性的函数</p> <ul><li><p>Object.seal()</p> <p>类似Object.preventExtensions(),但除了不让对象可扩展，它也会让对象的所有自有属性不可配置。这意味着不能给对象添加新属性，也不能删除或配置已有属性。不过，可写的已有属性依然可写。没有办法'解封'已被'封存'的对象。可以使用Object.isSealed()确定对象是否被封存</p></li> <li><p>Object.freeze()</p> <p>更严密的'锁定'对象，除了让对象不可扩展，让其属性不可配置，该函数还会让对象的全部自由属性变成只读的(如果对象有访问器属性，且该访问器属性有设置方法，则这些属性不受影响，仍然可以调用他们给属性赋值)。可以使用Object.isFrozen()确定对象是否被冻结</p></li></ul> <p>==上述方法都只影响传给自己的对象，而不会影响该对象的原型。==如果想彻底锁住一个对象，可能需要封存或冻结其原型链上的所有对象</p> <p>并且上述方法全部返回传给它们的对象，意味着可以在嵌套函数中调用它们</p> <h4 id="prototype特性"><a href="#prototype特性" class="header-anchor">#</a> prototype特性</h4> <ol><li><p>对象的prototype特性(原型)指定对象从哪里继承属性</p></li> <li><p>构造函数的prototype属性用于指定通过该构造函数创建的对象的原型(prototype特性)</p></li> <li><p>对象的prototype特性是在对象被创建时设定的</p> <ul><li>使用对象字面量创建的对象使用Object.prototype作为其原型</li> <li>使用new创建的对象使用构造函数的prototype属性的值作为其原型</li> <li>而使用Object.create()创建的对象使用传给它的第一个参数作为原型(可能为null)</li></ul></li> <li><p>要查询任何对象的原型，可以使用Object.getPrototypeOf()</p></li> <li><p>可以使用isPrototypeOf()判断一个对象是否是另一个对象的原型</p> <p>isPrototypeOf()的功能与instanceof操作符类似</p></li> 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